Non-constant-speed and non-symmetrical-crank-counterweight efficient and energy-saving oil pumping machine

The invention discloses a non-constant-speed and non-symmetrical-crank-counterweight efficient and energy-saving oil pumping machine which comprises a base, a motor, a gear box, a bracket and a crank, wherein only a balance counterweight facing an advancing direction of the crank is arranged at a counterweight end of the crank. According to the oil pumping machine, an advancing property of the crank is taken as kinetic energy to participate in distribution; mechanical energy and various gravitational energies are ingeniously and reasonably distributed on a track of oil pumping work by utilizing an eccentric gear and a non-circular gear; power of the motor is reduced; the electricity consumption is saved; the efficiency is improved; when the motor makes the oil pumping work and backlash work, the motor loads uniformly, and has no overcurrent or overvoltage impact; a failure is reduced; and the service life is prolonged. An eight-type machine is taken as an example; the motor power of the oil pumping machine is